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Matt et al,
I've been using ONAG for the past five years. I use a modified Vixen flip-mirror body where the mirror is replaced by a 92T/4R beamsplitter plate.
I now use a Lodestar guide camera and it works 100% on my C11 with the spectroscope.
I have a Baader helical focuser available on the guide port but to be honest it never really gets used. Once the target object is brought to a focus (Batihov mask etc) it's so simple to "ease" the guide camera into focus. You only have to do this once, so its a "Set and Forget" arrangement.
Being able to guide on axis and select any star in the guide FOV is great, for my spectroscopy, but if you're imaging faint fuzzies or nebulae you want to be able to possibly use the whole imaging field to find a suitable guide star...you can't do that unless the guide camera CCD chip is the same size as the imaging chip (unreasonable?) or be able to move the guide camera radially in the housing to look around the field.
Does this make sense?
All in all, it's an easy system to set up and use. The total cost of my 2" ONAG was $120.
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